The recent market volatility, especially triggered by ISM data and broader macroeconomic factors, has impacted crypto stocks and assets like Bitcoin, Coinbase, and MicroStrategy (MSTR). Predicting exact price movements in the short term is difficult, but let me address each point individually:

Bitcoin Falling to $50,000 in September:

Given that Bitcoin has dropped to $56,000, a further decline to $50,000 isn't out of the question, especially if macroeconomic conditions worsen, liquidity remains tight, or risk-off sentiment continues. However, Bitcoin's volatility also means that sudden rebounds are possible if market sentiment shifts, particularly if there are any positive regulatory developments or institutional moves into the market.

Is It a Good Time to Buy Crypto Stocks?

If you're preparing for a potential year-end rally, you're betting that sentiment will improve, possibly due to factors like regulatory clarity, institutional adoption, or broader market recovery. Dips like this can offer buying opportunities, but the crypto market remains high-risk and could experience further downside in the short term. The year-end rally might depend on various factors, including monetary policy decisions, inflation data, and global economic stability.

Target Buying Price:

Personally, a Bitcoin price of around $50,000 to $52,000 might be seen as an attractive entry point if you're looking for a longer-term hold and believe in a recovery. For Coinbase, I'd consider buying between $140 to $130 (maybe go as low as $125), where it seems to have better technical support, while for MSTR, a range between $105 to $115 could be appealing if you're factoring in its leverage to Bitcoin prices.

Impact of a Rate Cut in September:

If the Fed cuts rates in September (which seems less likely given current inflation concerns), it could benefit high-risk assets like crypto stocks by making borrowing cheaper and increasing liquidity. However, the market consensus at the moment seems to lean more toward maintaining or even increasing rates until inflation shows clearer signs of easing. A rate cut could trigger a rally in risk-on assets like crypto, but that scenario might come into play later, possibly in 2024 if economic conditions worsen.